<!DOCTYPE html>
<meta charset="utf-8">
<link rel=author href="mailto:masonf@chromium.org">
<link rel=help href="https://html.spec.whatwg.org/multipage/popover.html">
<link rel=match href="popover-anchor-inset-rule-display-ref.html">

<div popover=manual anchor></div>

<style>
  [popover][anchor] {
    background: green;
    width: 100px;
    height: 100px;
  }
  body { margin: 0; }
</style>

<script>
  document.querySelector('[popover]').showPopover();
</script>
